Attorney General Jeff Sessions is investigating up to $6 billion in legal settlement money that the Obama administration steered toward progressive causes and allies in left-wing advocacy groups.

A memo sent to US attorneys on July 28, published Friday by Breitbart news, ordered a review of a decade’s worth of payouts that Congressional Republicans have called a political slush fund.

Former Attorneys General Eric Holder and Loretta Lynch regularly arranged for major corporations to make large “donations” to left-leaning groups like UnidosUS — formerly the National Council of La Raza — and NeighborWorks America during settlement negotiations to end banking, environmental, civil-rights, and other federal lawsuits.

The groups getting the money were not victims in the cases or parties to the lawsuits, and Republicans say they had no proper claim to the cash.

That means that all punitive damages awarded in the cases should have gone directly into the US Treasury, say Republicans on the House Judiciary Committee who probed the scheme in 2015.

Instead, $3 billion of the multi-billion-dollar 2013 agreements with Citigroup and Bank of America to settle cases related to mortgage-backed securities went to community-organizing groups.

The $17 billion Bank of America deal gave the bank “extra credit” if it donated $100 million or more to activist groups approved by the Department of Housing and Urban Development.